/Engine/Source/Runtime/Core/Public/Internationalization/Internationalization.h
Get the current cultures in use, optionally including the current language, locale, and any asset groups.
[TArray](API\Runtime\Core\Containers\TArray)< FCultureRef > GetCurrentCultures ( const bool bIncludeLanguage, const bool bIncludeLocale, const bool bIncludeAssetGroups ) const